cartaction.java

采用struts+hibernate技术实现的网上书店系统

package org.web;

import java.util.ArrayList;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;
import org.dao.IBookDao;
import org.dao.IOrderDao;
import org.dao.impl.BookDaoImpl;
import org.dao.impl.OrderDaoImpl;
import org.model.Bookinfo;
import org.model.Order;
import org.model.Userinfo;
import org.web.interceptor.AuthenticationInterceptor;

import com.opensymphony.xwork2.ActionSupport;

public class CartAction extends ActionSupport implements SessionAware{
	
	//实例化dao
	IBookDao dao = new BookDaoImpl();
	
	IOrderDao orderDao = new OrderDaoImpl();
	
	private Map sessionMap = new HashMap();
	
	private Integer bookid;
	
	private String address;
	
	private String postcode;
	
	private List<Bookinfo> books;
	
	private Order order;
	
	private Integer orderID;
	
	//把书添加到购物车
	public String add()throws Exception{
		Bookinfo book = dao.getByID(bookid);
		//从session中取出list
		books = (List)sessionMap.get("cart");
		if(books==null){
			books = new ArrayList<Bookinfo>();
		}
		books.add(book);
		//存到session中
		sessionMap.put("cart", books);
		return "add";
	}
	
	//浏览购物车
	public String view()throws Exception{
		//从购物车取出所有的书
	    books = (List)sessionMap.get("cart");
	    //从登录用户会话中提取用户注册时候的地址和邮编
	    Userinfo user = (Userinfo)sessionMap.get(AuthenticationInterceptor.USER_SESSION_KEY);
	    if (user!=null){
	    	setAddress(user.getAddress());
	    	setPostcode(user.getPostcode());
	    }
		return "view";
	}
	
	//生成订单
	public String newOrder()throws Exception{
		
		books = (List)sessionMap.get("cart");
        // 将一份订单中的相同书籍记录合并成一条，并使数量加1
        Hashtable result = combineBook(books);
        // 将订单写入数据库
        Enumeration enu = result.keys();
      
        // 循环合并记录后的哈希表
        while (enu.hasMoreElements()) {
        	Order order = new Order();
    		order.setAddress(address);
    		order.setPostcode(postcode);
    		//设置状态为已付款
    		order.setStatus((short)1);
            order.setOrderdate(new Date(System.currentTimeMillis()));
            Userinfo user = (Userinfo)sessionMap.get(AuthenticationInterceptor.USER_SESSION_KEY);
            //设置哪个用户下的订单
            order.setUserinfo(user);
            //以下三行代码获得合并数量后的订单书本数量
            Integer bookid = (Integer) enu.nextElement();
            Integer number = (Integer) result.get(bookid);
            order.setNumber(number.shortValue());
            //getBookinfo方法:将book列表中,根据bookid返回符合的book记录
            //设置订单是哪本书
            order.setBookinfo(getBookinfo(books,bookid));
            orderDao.save(order);
        }
        

        //结帐后清空购物车
        sessionMap.remove("cart");
		return SUCCESS;
	}
	
	/**
	 * 将book列表中,根据bookid返回符合的book记录
	 * @param booklist
	 * @param bookid
	 * @return
	 */
	private Bookinfo getBookinfo(List<Bookinfo> booklist,Integer bookid){
		 for (Bookinfo book: booklist){
			 //如果存在相等的bookid，返回这个book对象.
			 if (book.getId().equals(bookid))
				 return book;
		 }
		 return null;
		  
	}
	
	/**
	 * 将一份订单中的相同书籍记录合并成一条，并使数量加1
	 * @param books
	 * @return
	 */
	private Hashtable combineBook(List books) {
		ListIterator iter = books.listIterator();
		//构造一个哈希表,以book的id为键，值为book的数量
		Hashtable result = new Hashtable();
		while (iter.hasNext()) {
			Bookinfo book = (Bookinfo) iter.next();
			if (result.get(book.getId()) == null) {
				//第一次放入,数量初始化为1
				result.put(book.getId(), new Integer(1));
			} else {
				Integer now = (Integer) result.get(book.getId());
				result.remove(book.getId());
				//第二次以上放入,数量为上一次统计的数量加一
				result.put(book.getId(), new Integer(now.intValue() + 1));
			}
		}
		return result;
	}
	
	public String viewOrder()throws Exception{
		order = orderDao.getByID(orderID);
		
		return "order";
	}

	public Integer getBookid() {
		return bookid;
	}

	public void setBookid(Integer bookid) {
		this.bookid = bookid;
	}

	public List<Bookinfo> getBooks() {
		return books;
	}

	public void setBooks(List<Bookinfo> books) {
		this.books = books;
	}

	public void setSession(Map map) {
		this.sessionMap = map;	
	}

	public Map getSessionMap() {
		return sessionMap;
	}

	public void setSessionMap(Map sessionMap) {
		this.sessionMap = sessionMap;
	}

	public String getPostcode() {
		return postcode;
	}

	public void setPostcode(String postcode) {
		this.postcode = postcode;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Order getOrder() {
		return order;
	}

	public void setOrder(Order order) {
		this.order = order;
	}

	public Integer getOrderID() {
		return orderID;
	}

	public void setOrderID(Integer orderID) {
		this.orderID = orderID;
	}
	
}